Vacuum pump O ring

Does anyone know a suitable sub for the large O ring on the vacuum pump of my 2004? I have it all torn apart and can't wait for the part to be ordered.
 
Found one at ACE hardware of all places! Looked at every auto parts store within 15 miles, no luck. ACE had quite the selection. The one I ended up using was actually SAE rather than metric so it was a bit thick. I thought it would cut on the install but it pressed in nice when I tightened it down.
 

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